<?php

	require_once($CFG->dirroot.'/lib/rsslib.php');
	require_once($CFG->dirroot .'/blog/lib.php');


	// This function returns the icon (from theme) with the link to rss/file.php
	// needs some hacking to rss/file.php
	function blog_rss_print_link($filtertype, $filterselect, $tagid=0, $tooltiptext='') {

		global $CFG, $USER;

		if (empty($USER->id)) {
			$userid = 1;
		} else {
			$userid = $USER->id;
		}

		switch ($filtertype) {
			case 'site':
				$path = SITEID.'/'.$userid.'/blog/site/'.SITEID;
			break;
			case 'course':
				$path = $filterselect.'/'.$userid.'/blog/course/'.$filterselect;
			break;
			case 'group':
				$path = SITEID.'/'.$userid.'/blog/group/'.$filterselect;  
			break;
			case 'user':
				$path = SITEID.'/'.$userid.'/blog/user/'.$filterselect;
			break;
		}

		if ($tagid) {
			$path .= '/'.$tagid;
		}

		$path .= '/rss.xml';
		$rsspix = $CFG->pixpath .'/i/rss.gif';

		require_once($CFG->libdir.'/filelib.php');
		$path = get_file_url($path, null, 'rssfile');
		print '<div class="mdl-right"><a href="'. $path .'"><img src="'. $rsspix .'" title="'. strip_tags($tooltiptext) .'" alt="'.get_string('rss').'" /></a></div>';

	}


	// Generate any blog RSS feed via one function (called by ../rss/file.php)
	function blog_generate_rss_feed($type, $id, $tagid=0) {
		global $CFG, $SITE;

		if (empty($CFG->enablerssfeeds)) {
			debugging('Sorry, RSS feeds are disabled on this site');
			return '';
		}

		$filename = blog_rss_file_name($type, $id, $tagid);

		if (file_exists($filename)) {
			if (filemtime($filename) + 3600 > time()) {
				return $filename;   /// It's already done so we return cached version
			}
		}

	/// Get all the posts from the database

		$blogposts = blog_fetch_entries('', 20, '', $type, $id, $tagid);

	/// Now generate an array of RSS items
		if ($blogposts) {
			$items = array();
			foreach ($blogposts as $blogpost) {
				$item = NULL;
				$item->author = fullname(get_record('user','id',$blogpost->userid));
				$item->title = $blogpost->subject;
				$item->pubdate = $blogpost->lastmodified;
				$item->link = $CFG->wwwroot.'/blog/index.php?postid='.$blogpost->id;
				$item->description = format_text($blogpost->summary, $blogpost->format);
				$items[] = $item;
			}
			$articles = rss_add_items($items);   /// Change structure to XML
		} else {
			$articles = '';
		}

	/// Get header and footer information
	 
		switch ($type) {
			case 'user':
				$info = fullname(get_record('user', 'id', $id, '','','','','firstname,lastname'));
				break;
			case 'course':
				$info = get_field('course', 'fullname', 'id', $id);
				break;
			case 'site':
				$info = $SITE->fullname;
				break;
			case 'group':
				$group = groups_get_group($id, false);
				$info = $group->name; //TODO: get_field('groups', 'name', 'id', $id)
				break;
			default:
				$info = '';
				break;
		}

		if ($tagid) {
			$info .= ': '.get_field('tags', 'text', 'id', $tagid);
		}

		$header = rss_standard_header(get_string($type.'blog','blog', $info), 
									  $CFG->wwwroot.'/blog/index.php', 
									  get_string('intro','blog'));
													  
		$footer = rss_standard_footer();


	/// Save the XML contents to file.

		$rssdata = $header.$articles.$footer;

		if (blog_rss_save_file($type,$id,$tagid,$rssdata)) {
			return $filename;
		} else {
			return false;   // Couldn't find it or make it
		}
	}


	function blog_rss_file_name($type, $id, $tagid=0) {
		global $CFG;

		if ($tagid) {
			return "$CFG->dataroot/rss/blog/$type/$id/$tagid.xml";
		} else {
			return "$CFG->dataroot/rss/blog/$type/$id.xml";
		}
	}
	
	//This function saves to file the rss feed specified in the parameters
	function blog_rss_save_file($type, $id, $tagid=0, $contents='') {
		global $CFG;

		if (! $basedir = make_upload_directory("rss/blog/$type/$id")) {
			return false;
		}

		$file = blog_rss_file_name($type, $id, $tagid);
		$rss_file = fopen($file, 'w');
		if ($rss_file) {
			$status = fwrite ($rss_file, $contents);
			fclose($rss_file);
		} else {
			$status = false;
		}

		return $status;
	}

?>
